Söderarm is the name of a deactivated Swedish lighthouse station and its surrounding small archipelago in the west part of the Sea of Åland. The light station is located on the island of Thorskär. This area, together with the tiny island of Tjärven north of Söderarm, marks the entrance for the shipping route leading to the ports of Kapellskär, Norrtälje, and also the north entrance to Stockholm. The area has been heavily fortified by the Swedish military and coastal artillery, and many traces of military activity from the years during the second world war are still visible.
https://en.wikipedia.org/wiki/S%C3%B6derarm
Söderarm is the name of a deactivated Swedish lighthouse station and its surrounding small archipelago in the west part of the Sea of Åland. The light station is located on the island of Thorskär. This area, together with the tiny island of Tjärven north of Söderarm, marks the entrance for the shipping route leading to the ports of Kapellskär, Norrtälje, and also the north entrance to Stockholm. The area has been heavily fortified by the Swedish military and coastal artillery, and many traces of military activity from the years during the second world war are still visible.
